Mask Fit Testing

Is Repiratory Mask Fit Testing Needed?

When workers are exposed to airborne hazards that cannot be eliminated, respiratory protective equipment must be used.

A mask fit test must be conducted anytime a worker 

  • is issued a mask for the first time
  • every two years after
  • if the make, model or size of mask changes
  • if the wear experiences significant facial changes

Mask fit testing ensures that the RPE (respiratory protective equipment) is properly sealing to the wearer's face, protecting them against harmful hazards.

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Qualitative or Quantitative Mask Fit

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Quantitative Fit Test

A more definitive test, this measures how much the mask may leak using a porta count machine. 

This test depends less on the wearers senses and provides more accurate results. 

This test is recommended for all types of masks including half and full faced respirators.


Qualitative Fit Test

This test depends on the workers sense of taste or smell. 

An irritants is introduced throughout the test and the wearer must indicate is they can identify it.

This test is recommended for N95 and half face masks. 

What Does The Test Include?

Our mask fit testing services include

  • A certified fit tester conducting fit test in accordance with CSA Standard Z94.4-02 
  • A mask fit test certificate provided to the wear including what mask they were tested on, how they were tested and when their next test is due
  • A record of the respirator fit tests provided to the employer including a pass/fail and mask information
  • A fit test questionnaire

Did you Know?

"Employers are required to take reasonable measures to use engineering, work practice or administrative controls before using respiratory protective equipment.  If respiratory protective equipment is used, employers are required to provide the appropriate equipment, maintain and store it properly, and ensure that it is properly fitted to the individual worker"

-Worksafe Alberta 2009